We also want to use a certain amount of finesse, taking care not to traumatize the sacrospinous ligament, arcus tendineus, or most importantly, the iliococcygeal, coccygeal, and obturator internus muscles.

It may be that the authorities quoted are including non-neural tube defects such as the radiological finding of single bifid L5 or S1 lamina and coccygeal pits in their classification of spina bifida occulta.

Currently, no universally accepted radiologic criteria for assessing pelvic floor dysfunction exist; however, the most widely accepted criteria involve organ movement below the pubococcygeal line (PCL), which extends from the inferior margin of the symphysis pubis to midway between the first and second coccygeal segments.

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